Pulling tool



PULLING TOOL Filed April 23, 1965 56 INVENTOR.

6 v LESL/E c. P/EECEI United States Patent Ofifice Patented Feb. 28,1967 3,305,919 PULLING TOOL Leslie C. Pierce, 2816 NW. 58th St.,Oklahoma City, Okla. 73112 Filed Apr. 23, 1965, Ser. No. 450,296 7Claims. (Cl. 29-213) This invention relates to a pulling tool,especially but not exclusively adapted for pulling the valve cores ofdrill pipe float valves.

The primary object of the invention is the provision of an efficient,more easily used device of the kind indicated, which is readilyadjustable for application to drill pipe collars, and the like, ofdiffering diameters, from which valve cores are to be extracted orpulled, without distortion and damage thereto.

In the drawings:

FIGURE 1 is a fragmentary diametrical section taken through a drill pipefloat valve assembly, showing a device of the invention applied to thevalve core and to the collar thereof;

FIGURE 2 is a bottom plan view of FIGURE 1;

FIGURE 3 is a fragmentary section, taken at right angles to FIGURE 1;and

FIGURE 4 is an enlarged perspective view of one of the adjustable drilltype collar engaging members.

Referring in detail to the drawings, a drill pipe float valve assembly Ais shown, which comprises a tubular housing or collar 10, formed with acounterbore 12, opening to an end 14 of the housing, and defining ashoulder 16, at the end of the counterbore, remote from the end 14. Atapered threaded socket 17 opens into the counterbore 12 from the collarend 14.

Force fitted into the counterbore 12 is a valve core 18 comprising atubular sleeve 20, which extends from the socket 17 to a point spacedfrom the counterbore shoulder 16, and confines in the-counterbore,between the sleeve and the shoulder 16, a valve seat 22.

The sleeve is formed intermediate its ends, with a cross member 24, hereshown as being of vertically disposed oblong cross section. A valve stem26 works in a hub 28, centered on the cross member 24 and carries avalve 30, a coil spring 32 being circumposed on the valve stem 26 andcompressed between the hub 28 and the valve 30, for yieldably seatingthe valve in the valve seat 22.

In order to gain access to the valve seat 22 and/ or the valve 30, forinspection or replacement thereof, it is necessary to apply a heavy pullto the sleeve cross member 24, so as to withdraw the valve core sleeve20 from the collar counterbore 12. Such withdrawal can be accomplishedin different ways and by the use of existing pulling tools orextractors, the use of which, however, can be attended by binding of thecore sleeve 20 in the counterbore 12, and difficulty in the removalthereof, as well as by damage to the parts, especially where collars ofdiffering diameters, and core sleeves 20 of different diameters areinvolved.

In accordance with the present invention, these difiiculties, andothers, are eliminated by the use of a pulling tool or extractor 34, Thetool 34 comprises a pair of similar and opposed rectangular arcuatecross section collar engagers 36, having flat straight leading edges 38,adapted to engage diametrically opposed areas of the outer end 14. Thetrailing edges 40 of the engagers 36 are centrally formed withtransversely elongated slots 42, having straight edges 44, spaced fromthe trailing edges 40, the material of the engagers being formed toprovide short transversely spaced, inwardly extending lugs 46, whoseflat inner surfaces 48 face, and are paral lel to the slot edges 44, soas to provide slideways 50.

The slideways 50 slidably and adjustably receive spaced portions of atransversely elongated, preferably flat pressure bar 52, the pressurebar being longer than the maximum diameters of collars 10 contemplated.As indicated in FIGURES 1 and 2, the engagers 36 are adjusted, on thepressure bar 52, to positions wherein their leading edges 38 engage theend 14 of the collar 10.

The pressure bar 52 is provided with a central smooth opening 54,slightly larger in diameter than an extracting screw 56, which extendstherethrough. The opening 54 is axially aligned with an annular taperedrecess 58, formed in the outerside, of the pressure bar 52, in which isengaged the conformably tapered end 60 of a nut 62. The nut 62 has athreaded bore 64 through which the screw 56 is threaded. Diametricallyopposed lateral handle members 66 are provided on the nut 62.

The screw 56 has suitably secured, on its inner end, a polygonal crosssection cross bar 68 which extends to opposite sides thereof, and isrotatable on the screw. Elongated hooks 70, reversed with respect toeach other, comprise generally rectangular outer end portions 72, whichare formed with centered polygonal openings 74, which slidably andnon-rotatably receive the cross bar 68, at opposite sides of the screw56, and are adjustable along the cross bar. Straight offset shanks 76extend from the end portions 72, which terminate in curved crooks 78. Asshown in FIGURES 1 and 3, the crooks 78 are adapted to be engaged overthe related portions of the valve core sleeves cross member 24, atopposite sides of the valve stem 26, with the crooks 78 reversed withrespect to each other, so as to distribute pull on the cross memberevenly, and to avoid lateral stresses on the valve core, as the same isbeing extracted.

In operation, the handle members 66 are utilized to rotate the nut 62,in a direction to move the screw outwardly relative to the collar 10,and thereby pull the core sleeve 20, accompanied the valve stem 26 andthe valve 30, out of the counterbore 12, and out through the end 14 ofthe collar, far enough to enable the hooks 70 to be disengaged from thecross member, and the tool to be removed from the collar 10, whereat thecore 18 is available to be easily withdrawn entirely out of the collar,by hand or by other suitable means.

What is claimed is:

1. In combination, a tubular collar having an end, said collar having abore, a sleeve frictionally engaged in the bore, said sleeve having afixed cross member extending thereacross, a pulling tool comprising apair of diametrically opposed engagers having leading edges engaged withsaid end of the collar, said engagers having slideways extendingtherethrough, a pressure bar longer than the diameter of the collar,said slideways adjustably receiving the pressure bar, said pressure barbeing centrally formed between the engagers with a smooth opening, ascrew extending through said 0pening, an enlarged recess aligned withsaid opening and communicating therewith, a nut threaded on the screwand rotatably engaged in said recess, a rotatable cross bar fixed on anend of the screw and extending into said sleeve, and hooks being engagedon the cross bar at opposite sides of the screw and engaged over thesleeve cross member, and means for rotating the nut.

2. The combination of claim 1, wherein said cross bar is of polygonalcross section, said hooks having end portions formed with polygonalopenings slidably and non rotatably receiving the cross bar, at oppositesides of the screw.

3. The combination of claim 1, wherein said cross bar is of polygonalcross section, said hooks having end portions formed with polygonalopenings slidably and nonrotatably receiving the cross bar, at oppositesides of the screw, laterally and oppositely offset shanks on said hookend portions, said shanks extending along opposite sides of the crossbar, said shanks terminating in oppositely directed crooks engaged overthe cross bar.

4. In combination, a drilling float valve comprising a tubular collarhaving an open end, a counterbore ex- E tending inwardly from said oneend and defining a shoulder at the end of the counterbore remote fromsaid one end, a valve core comprising a sleeve plug-fitted in said boreand having an inner end spaced from said shoulder, an annular valve seatengaged in said counterbore between said shoulder and the inner end ofthe sleeve,

bar being formed with a central smooth opening extending therethrough,the outer side of the pressure bar being i formed with an enlargedrecess opening to said smooth -opening, a screw extending through saidopening and into said counterbore, a nut engaged on the screwandrotatably sealed in said recess, a cross bar rotatably engaged on theinner end of the screw, reversed hooks on the cross bar at oppositesides of the hub, said hooks 1 being engaged over the sleeve crossmember at opposite sides of the hub, and means for rotating the screw.

5. A pulling tool comprising a transverse pressure bar having slidablyadjustable engagers on its opposite ends and extending laterallytherefrom, said pressure bar being formed with a central smooth opening,the side of the pressure bar remote from the engagers being formed withan enlarged diameter recess aligned with said opening, a screw extendingfreely through the opening of the pressure bar, a nut threaded on thescrew and rotatably engaged in said recess, the end of the screw remotefrom said nut carrying a rotatable cross bar, hooks slidably engaged onopposite ends of the cross bar, and means for rotating the nut.

6. A pulling tool according to claim 5, wherein said cross bar is ofpolygonal cross section, and said hooks have end portions formed withpolygonal openings slidably and non-rotatably receiving the cross bar.

7. A pulling tool according to claim 5, wherein said cross bar is ofpolygonal cross section, and said hooks have end portions formed withpolygonal openings slidably and non-rotatably receiving the cross baroppositely, offset shanks extending from said hook end portions, andoppositely directed crooks on said shanks.

References Cited by the Examiner UNITED STATES PATENTS 5/1954 Lee 292597/1961 Baker 29259

5. A PULLING TOOL COMPRISING A TRANSVERSE PRESSURE BAR HAVING SLIDABLYADJUSTABLE ENGAGERS ON ITS OPPOSITE ENDS AND EXTENDING LATERALLYTHEREFROM, SAID PRESSURE BAR BEING FORMED WITH A CENTRAL SMOOTH OPENING,THE SIDE OF THE PRESSURE BAR REMOTE FROM THE ENGAGERS BEING FORMED WITHAN ENLARGED DIAMETER RECESS ALIGNED WITH SAID OPENING, A SCREW EXTENDINGFREELY THROUGH THE OPENING OF THE PRESSURE BAR, A NUT THREADED ON THESCREW AND ROTATABLY ENGAGED IN SAID RECESS, THE END OF THE SCREW REMOTEFROM SAID NUT CARRYING A ROTATABLE CROSS BAR, HOOKS SLIDABLY ENGAGED ONOPPOSITE ENDS OF THE CROSS BAR, AND MEANS FOR ROTATING THE NUT.